The variation of the mean diameters of the photospheric granules near sunspots.
Abstract
The effect of the sunspot magnetic field on the sizes of photospheric granules located in the vicinity of the penumbra (within 1-2 arcsec from the penumbra-photosphere boundary) is studied. The sizes were measured with respect to those of granules located far from the penumbra (20-50 arcsec). It is confirmed that the mean diameter of the granules is smaller in the neighbourhood of the penumbra; moreover, the size of these granules is smaller for large values of the umbral magnetic field.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1979
- Bibcode:
- 1979A&A....78..186M
- Keywords:
-
- Size Determination;
- Solar Granulation;
- Solar Magnetic Field;
- Solar Physics;
- Sunspots;
- Diameters;
- Oculometers;
- Penumbras;
- Photosphere;
- Temperature Gradients;
- Umbras;
- Solar Physics;
- Diameters:Solar Granules;
- Solar Granulation:Sunspots